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Aldebaran Slips Behind the Rings.

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Aldebaran Slips Behind the Rings.
Aldebaran twinkles behind the rings. Image credit: NASA/JPL/SSI.

In this Cassini image, the bright giant red star Aldebaran slips behind Saturn's rings. This kind of view is known as a stellar occultation, and it gives scientists an opportunity to study the rings themselves by how the block and distort light from the star. The star's light fluctuates as it passes behind various regions of the rings, providing details on ring thickness and composition.

The Cassini spacecraft took a series of images on Sept. 9, 2006 as it watched the bright red giant star Aldebaran slip behind Saturn's rings. This type of observation is known as a stellar occultation and uses a star whose brightness is well known. As Cassini watches the rings pass in front of the star, the star's light fluctuates, providing information about the concentrations of ring particles within the various radial features in the rings.

This view shows the Encke Gap (325 kilometers, or 200 miles wide) and the faint ringlets which share the gap with the embedded Moon Pan. The view looks toward the sunlit side of the rings from about 19 degrees below the ringplane. Bright Aldebaran is overexposed, creating thin vertical lines on its image.

The image was taken in visible light with the Cassini spacecraft narrow-angle camera on Sept. 9, 2006 at a distance of approximately 359,000 kilometers (233,000 miles) from Saturn. Image scale on the sky at the distance of Saturn is 2 kilometers (1 mile) per pixel.

The Cassini-Huygens mission is a cooperative project of NASA, the European Space Agency and the Italian Space Agency. The Jet Propulsion Laboratory, a division of the California Institute of Technology in Pasadena, manages the mission for NASA's Science Mission Directorate, Washington, D.C. The Cassini orbiter and its two onboard cameras were designed, developed and assembled at JPL. The imaging operations center is based at the Space Science Institute in Boulder, Colo.

For more information about the Cassini-Huygens mission visit http://saturn.jpl.nasa.gov. The Cassini imaging team homepage is at http://ciclops.org.

Original Source: NASA/JPL/SSI News Release

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